Microhardness and microstructure evolution of ultra-fine grained Ti-15Mo and TIMETAL LCB alloys prepared by high pressure torsion

Václavová, Kristína; Stráský, Josef; Polyakova, Veronika; Stráská, Jitka; Nejezchlebová, Jitka; Seiner, Hanuš; Semenova, Irina P.; Janeček, Miloš

doi:10.1016/j.msea.2016.11.038

Cited by 33 publications

(26 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is assumed that since stearic acid avoided cold-welding, the contamination by oxygen and nitrogen is present predominantly at the particles surface. Therefore, the observed hardening can be mostly attributed to the microstructure refinement, which is consistent with results in [30].…”

Section: Microhardnesssupporting

confidence: 89%

“…These deformation modes are very similar to those during rolling. Indeed, the observed texture is very similar to rolling texture in Ti, where <0001> poles are tilted by [30][31][32][33][34][35][36][37][38][39][40] • from the normal towards transverse direction and <1010> poles pointing towards the rolling direction [29], which is caused by the preferential activation of specific slip systems. Note that texture was determined with respect to the lamella surface, while particle plane might be slightly tilted, which accounts for differences between typical rolling texture and the observed texture.…”

Section: Texturementioning

confidence: 97%

See 1 more Smart Citation

Cryogenic Milling of Titanium Powder

Kozlík

Stráský

Harcuba

et al. 2018

Metals

Self Cite

View full text Add to dashboard Cite

Ti Grade 2 was prepared by cryogenic attritor milling in liquid nitrogen and liquid argon. Two types of milling balls were used-stainless steel balls and heavy tungsten carbide balls. The effect of processing parameters on particle size and morphology, contamination of powder and its microhardness was investigated. Milling in liquid nitrogen was not feasible due to excessive contamination by nitrogen. Minor reduction of particle size and significant alterations in particle morphology depended on type of milling balls and application of stearic acid as processing control agent. Heavily deformed ultra-fine grained (UFG) internal microstructure of powder particles was observed by the method of "transmission Kikuchi diffraction".

show abstract

Section: Microhardnesssupporting

confidence: 89%

Section: Texturementioning

confidence: 97%

Cryogenic Milling of Titanium Powder

Kozlík

Stráský

Harcuba

et al. 2018

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…It can be therefore concluded that 4 ECAP passes (corresponding to Von Mises equivalent strain of ε VM = 2.67) are sufficient for the formation of ultrafine grained structure. This is in accordance with the observations of Ti-15Mo alloy deformed by high pressure torsion [13].…”

Section: Materials and Experimentalsupporting

confidence: 93%

“…3. Values of elastic modulus and microhardness of solution treated material ("0 passes") originate from [15] and [13], respectively. Microstructure refinement may cause an increase of microhardness due to increased concentration of lattice defects, while the elastic modulus should either remain unchanged or exhibit decrease due to the presence of open volume defects.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Ti-15Mo Alloy Prepared by ECAP

et al. 2018

View full text Add to dashboard Cite

Metastable beta titanium alloys are perspective materials for use in biomedicine due to their excellent mechanical and physical properties, which can be improved by severe plastic deformation by reducing grain size and inserting a high degree of deformation. Ti-15Mo alloy was subjected to 1-4 passes of equal channel angular pressing in a die with channels intersecting at an angle of 120 • at the temperature of 250 • C. The microstructure observed by means of electron backscatter diffraction showed deformed and highly twinned structure, but the deformation was not sufficient for achieving an ultrafine grained material. The microhardness increased with the increasing number of equal channel angular pressing passes. The Young modulus was measured by the methods of resonant ultrasound spectroscopy and also increased with the number of equal channel angular pressing passes. Significant increment of elastic modulus can be attributed to the formation ω-phase particles.

show abstract

“…It was shown that the high sensitivity of this method enables examination of formation and growth of u ath particles that is quite difficult to observe by previously mentioned conventional techniques. Furthermore, post-mortem study by RUS of TIMETAL LCB and Ti15Mo alloys after plastic deformation by high pressure torsion proved the occurrence of deformation-induced u phase [27].…”

Section: Introductionmentioning

confidence: 91%

On the complementarity between resistivity measurement and ultrasonic measurement for in-situ characterization of phase transitions in Ti-alloys

Nejezchlebová

Seiner

Sedlák

et al. 2018

Journal of Alloys and Compounds

View full text Add to dashboard Cite

We present the results of in-situ characterization of the phase transitions in metastable b-Ti alloy Ti5553 by contactless laser-based resonant ultrasound spectroscopy method and electrical resistance measurement in a four probe configuration. Phase transformations were studied during continuous heating from the room temperature to 700 C with various heating rates. We showed that both methods provide complementary results and can be successfully used for observation of phase transitions in metastable b-Ti alloys.

show abstract

Microhardness and microstructure evolution of ultra-fine grained Ti-15Mo and TIMETAL LCB alloys prepared by high pressure torsion

Cited by 33 publications

References 47 publications

Cryogenic Milling of Titanium Powder

Cryogenic Milling of Titanium Powder

Microstructure and Mechanical Properties of Ti-15Mo Alloy Prepared by ECAP

On the complementarity between resistivity measurement and ultrasonic measurement for in-situ characterization of phase transitions in Ti-alloys

Contact Info

Product

Resources

About